Just got my new (Ok new to me) 72 Blazer, I didn't look closely when I was buying it, but I notice that the hard top must be bolted from the bottom up, not the top down like others I have seen. This top also seems to be thicker or insultated. Does anyone know if they made two kinds of tops? I would really rather have the other style with the top down bolts so that I can put panels on the walls of my bed and still get the top on and off easily. Any ideas?